Airfoil



FIG. 1 is a rear perspective view of the airfoil showing my new design.

FIG. 2 is a rear elevational view of my design.

FIG. 3 is a front perspective view of my design.

FIG. 4 is a top plan view of my design.

FIG. 5 is a bottom plan view of my design.

FIG. 6 is a right side elevational view of my design; and,

FIG. 7 is a right side elevational view of my design.

The ornamental design for an airfoil, as shown and described.